Method and means of lining pipe molds



Aug. 12 1924. 1,504,497

J. A. PERRY METHOD AND MEANS OF LINING PIPE MOLDS Original Filed June27. 1921.

I n I n w m/ Ww w fi M a n n :m T2 I JOHN A. PERRY, OF TORONTO, ONTARIO,CANADA.

METHOD AND MEANS OF LINING PIPE MOLDS.

Application filed June 27, 1921, Serial No. 480,873. Renewed June 25,-192 1.

To all whom it may concern.

Be it known that I, JOHN A. PERRY, a subject of the King of GreatBritain, and resident of the city of Toronto, county of York, Provinceof Ontario, in the Dominion of Canada, have invented certain new anduseful Improvements in Methods and Means of Lining Pipe Molds, describedin the following specification and illustrated in the accompanyingdrawings, that form part of the same. v

The principal objects of this invention are to reduce the cost ofmanufacture of cast. iron pipes and to greatly facilitate thequantityproduction of such articles by pro duclng in a simple andeffective manner a substantial form of mold for shaping the metal. v Theprincipal feature of the invention consists in the novel manner ofplacing within a cylindrical casing a lining of refractory materialwhereby the said material is uniformly distribute-d over the inter1or ofthe casing through centrifugal action, and whereby the surface of therefractory material is shaped to the desired form and rendered smoothand hard to form a desirable surface for the moulding of the iron.

In the accompanying drawings, Figure 1 is a diagrammatic elevationalview of a machine embodying this invention.

' Figure 2 is an end elevational view.

Figure 3 is an enlarged cross sectional view through the mold casing andsand supporting trough showing the trough in the initial position.

Figure 4 is a cross sectional view through the mold casing and sandtrough showing the trough partly dumped.

Figure 5 is a cross sectional view showing the refractory liningcompleted.

Figure 6 is an enlarged longitudinal sectional view of a portion of oneof the ends of the mold showing the formation of the.

lining for the bell end of a pipe.

In the casting of iron pipe many devices have been proposed in which themetal is flowed over the mold surface by a centrifugal action and it hasbeen known to line such molds with refractory material but such liningshave not apparently been successful in operation as the laterdevelopment of the art shows the use of centrifugal molds wherein themolten metal is poured into contact with metallic surfaces. In suchdevices the problem of cooling the molds surface 3 of the collar 2 Iplaced therein.

has been a great difliculty and further the use of metallic moldsnecessitates the special treatment of the pipe after it is formed as itis chilled by contact with a metal surface.

By my improved method of lining a mold casing with refractory material,I am able to present an extraordinarilysmooth and hard surface whichwill not chill the metal poured thereinto and the process is extremelysimple and effective.

In the application of the invention herein shown, the mold casing 1 isof cylindrical form and may be made of standard pipe. At one end of thispipe is secured a collar 2 which serves the double purpose of forming alarger diameter for the shaping of the bell and of the mold and alsoforms an external bearing surface 3 upon which the mold is rotatablysupported.

Suitable journals 4 and 5 are arranged upon a base 6 at either side ofthe longitudinal centre of the mold casing and between these journalsare supported the parallel shafts 7. Rollers 8 are mounted on theseshafts at one end to support the bearing and rollers 9 are secured tosaid shafts at the opposite end to engage a collar 10 encircling themold casing. This collar is preferably provided with a circumferentialchannel 11 to engage the larger diameter 12 of the rollers 9, thusholding the moldfrom longitudinal movement. The shafts are rotated in asuitable ma-nner to impart rotation to the mold casing, a sprocket 13being shown upon one of these shafts to be suitably driven.

flange ring 14 is secured to the end of the casing 1 adjacent to thecollar 10 and to this flange ring is secured a ring plate 15 whichpartly closes the end of the mold to securely retain the sand liningwhen it is which is adapted to be rotated in the carriage and about itsown axis by means of a Worm wheel 20 and worm 21 operated by a suitablehand wheel 22. The tubular member projects from the opposite end of thecarriage and it is cut away for the major A similar plate 16 is securedto the bell end of the mold.

ver'sely adjustable, a slot 29 being shown in the cross bar.

The axial centre of the trough 23 is arranged slightly eccentric to theaxial centre of the mold casing 1 so that one side of the trough will becloser to the interior wall of the mold casing than the other. At oneedge of the trough is secured a sweep 30 which is a strip of suitablematerial which is adapted to sweep the surface of the sand dumped fromthe trough into the casing. This sweep will be enlarged atthe bell endto shape the inner surface of the mold to the desired contour asindicated by the numeral 31 in Figure 6.

The opposite end of the sweep may be shaped to form a bead for thespigot end of the pipe.

v In the operation of this invention, the mold casing 1 is placed intoposition upon the rotating rollers 'and it is rotated at a desirablespeed. The trough 23 is loaded from end to end with the sand for thelining and the carriage is then moved to insert the trough into themoldcasing and the end is suitably supported in the bearing carried onthe standards 27 The operator then rotates the trough slowly by means ofthe hand wheel and worm gear, tipping it so that the sand will be splitinto the rotating mold casing. The rapid rotation of the mold casingholds the sand to its inner wall and the sand is thus built up aroundthe inner surface of the mold casing and as the said trough is turnedcompletely over and deposits the last of its load, the sweep 30 isbrought into closer relationship to the interior wall of the casing 1 byreason of the eccentric arrangement of the casing and trough.

The sweep thus moves gradually into contact with the swiftly revolvingsand lining and it smoothes it and packs it tightly in place, shavingthe surface at the bell and spigot ends forming a hard, smooth surfacewhich will be capable of withstanding the contact of the flow of themolten metal afterwards to be deposited therein by a suitablecentrifugal casting machine.

the metal within the mold is not a portion of this invention. It will beunderstood however that mold casings may be placed upon the liningmachine to be lined and then removed and placed upona casting machine,if desired. In this way the operation of the lining machine may bemaintained continuously. By lining the molds in the manner described,the expense of water cooling equipment and operation is dispensed with.It enables a Very rapid production. It renders possible the use oflnexpensive mold casings and as the casing is lined with sand, the pipesmay be formed with beaded spigot ends and they will be easily withdrawn.

The most important consideration in connection with this invention isthat the metal of the cast pipe is poured into a sand mold andis notchilled and therefore does not require an expensive annealing process toproduce a marketable article.

What I claim as my invention is 1. A method of lining pipe molds withrefractory materiaL consisting in distributing the refractory materialfrom a central holder circumferentially over the inner surface of acylindrical casing while said casing is rapidly rotating and finallysmoothing and compressing the material so distributed to a uniformthickness.

2. A means for lining pipe molds, comprising, a cylindrical rotatingmold casing, means for containing a quantity of loose refractorymaterial adapted to be projected into the mold casing to deposit saidrefractory material .uniformly from end to end of said casing, and meanssupported by said carrier for smoothing and compressing the surface ofthe refractory material deposited within the rotating mold casing.

3. Means for lining pipe molds, comprisa rotatable cylindrical moldcasing, a trough member movable longitudinally and adapted to extendinto said mold casing and arranged in eccentric relation thereto. andadapted to be rotated to deposit a charge of molding sand within themold casing, and a sweep secured to the outside of said trough adaptedto be brought'into contact with the sand distributed over the surface ofthe mold casing by the centrifugal action of its rotation and to smoothand compress the sand to a uniform density and thickness.

